Reversing-valve.



PATENTED JUNE 26,1906.

H. AIKEN. RBVERSING VALVE.

APPLIOAT IOH FILED APB-21. 1904.

N288 IS 7 "UNITED STATES PATENT. oFFIoE.

Specification of Letters Patent.

Patented June 26, 1906.

Application filed April 21, 1904:. Serial No. 204,211.

To all whom it may concern.-

Be it known that I, HENRYAIKEN, of Pittsburg, Allegheny county, Pennsylvania, have invented a new and useful Reversing-Valve, of which the following is a full, clear, and exact dGSCI'lPtlOIlyIQfGI'GIlCG being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a longitudinal vertical section showing the preferred form of my improved valve. regular line 2 2 of Fig. 1, and Figs. 3 and 4 are respectively a detail side elevation and broken cross-section showing the bearing of the sealing-roller.

My invention relates to the class of reversing-valves for regenerative furnaces, and more particularly to the butterfly type of valve, wherein an oscillating valve-plate controls the three generative ports.

The object of the invention is to prevent I leakage of gas to the stack and to seal the valve in its respective'positions.

In the drawings, 2 2 represent regeneratorports, and 3a stack-port between them, these being covered by a valve-casing 4 containing the butterfly-valve 5. This valve is hung up on oppositely projecting trunnions 6 6, mounted in bearings inthe sides of the casing and having a squared shaft 7, provided with operating-lever 8.

9 is the gas-inlet port, controlled by the valve 10, actuated by the externally-projecting lever 1 1. 35

. The butterfly-valve is of ordinary form, except that its upper edge is preferably rounded off to give a convex form, as shown at 12. Instead of using stationary seats for the valve edges in'the two positions I preferably lower stationary seats 13 for the lower edge of'the valve, these seats preferably being watercooled by inlet and outlet pipes 14 and 15, leading in on opposite sides of a central bevel 16. J i

The upper seats in the casing consist of rollers or sealing-pieces l7 which are arranged to rest by gravity upon the upper edge of the valve when in their adjusted position. Each roller maybe mounted upon end tap-bolts 18, extending through slots in the casing and providedxwith gcovering-washers 19. The

Fig. 2 is a vertical section on the ir' slots allow movement of the roller toward and from the valve, and the parts are so arranged that as the valve swings to place its convex surface lifts the roller slightly, the roller then resting in contact withit by the action of gravity, when the lower edge of the valve is agalnst the stationary seat. The rollers preferably rest upon inclined end ledges 20, as shown n Fig. 3, which guide and support the rollers 1n their sliding and rolling movements.

In the operation of the valve the butterfly is reversed in the usual manner, and as 1t moves to either adjusted position the lower edge seats against the stationary watercooledseat, while the upper portion automatically lifts the roller and seats against 1t. Any variation in the length of the valve owing to the expansion or contraction under heat will thus be compensated for and a tight valve obtained.

The advantages of my inventionresult from the substantial preventing of leakage of the gas to the stack and the simplicity and cheapness of the valve, The unequal expansion of the two legs of the valve which has heretofore prevented proper seating does notinterfere with the tight seating in my valve, since the movable roller compensates for any such changes.

Many variations may be made in the form and arrangement of the shifting seat and the other parts without departing from my invention l I claim e 1. A butterfly reversing-valve having a shiftable gravitating seat arranged to rest yieldingly u on and seal the edge of the valve and guides or the said seat; substantially as described.

2. A butterfly reversing-valve having two automaticallyshiftable loosely gravitating seats arranged to rest upon one edge of the valve, and two stationary seats arranged to engage the opposite edge of the valve and guides upon which the seats move in shifting; substantially as described. I

3. The combination with a butterfly re versing-valve, of a seat therefor, formed by a loose, gravitating, roller, arranged to be moved by the valve in seating; substantially as described.

4. A butterfly reversing-valve having a on by gravity when the valve is in closed po' 10 shifting roller-seat, the roller constituting sition; substantially as described. such seat being arranged to be moved by con- 1 In testimony whereof I have hereunto set tact With the edge of the valve in seating; submy hand.

stantially as described. 7 T T T 5. A reversing butterfly-valve having up- HEB R1 AIKEN per opposite rollers loosely mounted in the Witnesses:

casing, the valve having convex upper edges JOHN MILLER, arranged to shift the rollers Which rest there- H. M. CORWIN. 

